Merge branch '97-cascade-example-debugging-2' into 'master'

.gitlab-ci.yml

Documentation/Examples/cascade_example.cc

Framework/Cascade/Cascade.h

Framework/Cascade/testCascade.cc

Framework/ProcessSequence/ContinuousProcess.h

Framework/ProcessSequence/ProcessReturn.h

Framework/ProcessSequence/ProcessSequence.h

Framework/Units/PhysicalUnits.h

Processes/Sibyll/Decay.h

Processes/Sibyll/Interaction.h

Processes/Sibyll/ParticleConversion.h

Processes/Sibyll/sibyll2.3c.cc

Processes/TrackingLine/TrackingLine.h

Stack/SuperStupidStack/SuperStupidStack.h

Stack/SuperStupidStack/testSuperStupidStack.cc